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Insisting its future hinges on a crunch vote next month, the former leader warned the anti-EU party could be "worthless" in 18 months time without major structural change.

The comments by Farage come amid a crisis over the leadership of current UKIP head, Henry Bolton and allegations over his private life.

Farage has suggested Bolton may still be able to ride out the storm, but Professor Alan Sked, the man who founded UKIP, has told Euronews that the current leader has made the party a laughing stock and it is now time for it to disappear.